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FANUC Controller
Program/G-code · Intermediate · 5-30 minutes
Fanuc 249 - Duplicate axis name
Alarm 249 occurs when the part program attempts to define the same axis designation more than once in a single block or command statement. This is most commonly seen in custom macro programs, G10 offset setting commands, or coordinate system definitions where an axis letter (X, Y, Z, etc.) appears multiple times with different or conflicting values.
249
Fanuc 249 - Duplicate axis name
DUPLICATE AXIS NAME
Fanuc PS program alarm 249: DUPLICATE AXIS NAME. This alarm is triggered by an illegal or incorrectly formatted command in the part program, or a programming condition that the Fanuc control cannot execute.
Root Cause Summary
Alarm 249 occurs when the part program attempts to define the same axis designation more than once in a single block or command statement. This is most commonly seen in custom macro programs, G10 offset setting commands, or coordinate system definitions where an axis letter (X, Y, Z, etc.) appears multiple times with different or conflicting values.
Safety
- Verify corrected program or parameters before resuming machining
Causes and Fixes
- 1
Press RESET to clear the alarm and note the exact program number and line number (N-number or sequence) displayed with the alarm.
- 2
Access the program in EDIT mode and navigate to the alarmed block using the search or cursor function.
- 3
Examine the block carefully for any axis letter that appears more than once (check for X, Y, Z, A, B, C, U, V, W).
- 4
Remove the duplicate axis address or consolidate into a single correct value, save the program, reset the control, and test the corrected block in single block mode.
Verify the intended coordinate before deletion to ensure the correct value is retained.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
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